Standard Science Primary 4 Energy

Which material is most suitable for making the lens of a pair of spectacles?

A Frosted glass
B Aluminium sheet
C Opaque plastic
D Clear glass
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Worked Solution

Step 1: Spectacle lenses must allow the wearer to see clearly. Step 2: This requires a transparent material that allows most light to pass through. Step 3: Clear glass (or clear plastic) is transparent.

Correct answer: Clear glass

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